Extreme Hard Night Guard for Heavy Teeth Grinding


Extreme Durability Hard Night Guard for Severe Teeth Grinding and Jaw Clenching (Bruxism)

Made with dentist-grade, hard acrylic-like material, your Extreme Durability Hard Night Guard is non-flexible and built to last. Safe for nightly use or as recommended by your dentist.

  • Custom fit to your unique dental anatomy
  • BPA, Silicone, Gluten, Latex, MMA and Phthalate free. Learn more about material safety here.
  • 3mm thickness for maximum protection
  • Non-flexible. Snaps into place for a perfect fit
  • Relieves jaw pain, teeth pain, headaches, tooth sensitivity
  • Protects teeth from breakage, cracking, damage
  • Protects veneers, crowns, restorative dental work
  • Combats pain or tenderness of the TMJ
  • Easy dental impression instructions + extra putty if a reattempt is needed
  • Excellent durability and clarity
  • Love it or your money back! Guaranteed to make you smile.

What You’ll Get

  • A complete impression kit with instructions, extra putty and prepaid return mailer
  • (1) custom night guard for heavy duty teeth grinding and jaw clenching
  • Breathable retainer case
  • Fast all inclusive FREE shipping
  • 1 year warranty
EAN: 697566004698 SKU: 14188 Categories: , , ,

Product Description

Extreme Hard Night Guard for Heavy Duty Teeth Grinding and Jaw Clenching

Made with dentist-grade hard acrylic-like material, your Sentinel Night Guard is non-flexible and built to last. Safe for nightly use.

All of our night guard products are BPA, Gluten, Silicone, MMA, Latex and Phthalate free.

Learn more about the safety of our mouthguard materials here

Our commitment to you is 100% satisfaction. We provide free night guard adjustments and will always work to make you smile.

Not sure which night guard to choose? Take our 60 sec. quiz!

which night guard is right for you


Wake up Smiling or Your Money Back

The Sentinel Guarantee

Located in St. Petersburg, Florida, we specialize in night guard and mouth guard manufacturing.  All of our products are made in our lab by professional lab technicians.

We guarantee:

    • 100% unconditional money back guarantee. We stand behind our products and will provide you with nothing less than our personal best from our long-standing team. If you’re not completely satisfied, return within 90 days for a full refund.
    • 90 Day option to let us get it right. If you don’t love your new night guard let us know within 90 days. We’ll work hard to make it right!
    • 1 Year Warranty.


Due to its thicker nature, we require that you take upper and lower teeth impressions for an even bite and to ensure proper occlusion.

take your dental impression with me

Defend Your Teeth Against The Daily Grind

3mm thickness is ideal for severe nighttime grinding or jaw clenching.

FREE SHIPPING IN THE USA (international customers are responsible for shipping on return mailer).

Product Reviews

  • Sarah34

    I absolutely love it!
    My mouth feels so much relief and the customer service is spectacular. It is so much better than another company that I had tried previously. The fit is perfect for my mouth and I feel comfortable wearing it.

  • Mason Berger

    Been wearing mine for a few weeks and it’s been a life changer. My headaches and jaw soreness are gone! I’ve had many night guards through the dentist. I’ve paid a lot of money for these things. It’s nice to find an affordable option that still has the high quality I need. Thank you!

  • Iris W.

    Not super comfy at first but really nice looking. I love that they are super low profile and the quality is great for the price. I totally recommend these.

  • Tom Sphar

    Tip from a customer who learned the hard way! Don’t bite down into the putty. Keep your mouth relaxed and press the putty filled tray into your teeth evenly. After 3 tries I finally got it right!
    The sentinel team was gracious and gave me two free kits. Best company ever! My mouth guard fits perfect and my jaw feels so much better. No more popping and clicking!

  • Adam S.

    So first of all, this was super easy to take the impressions. All you have to do is mix the putty, place it in the tray and then slide the tray into the mouth. Push the putty up into the teeth and wait. It will get hard and may feel tough to pull out. Don’t panic. Just use more fingers to “pop” it off the teeth. A tip for putting the tray with putty into the mouth: have a timer on hand and stand in front of a mirror so you can see what you’re doing. It took me two attempts. This may sound confusing, but make sense when you are assembling it.

    Okay! The actual guard itself! It has really nice material & the shaping is well done. One piece in the front was a bit loose, but otherwise feels great. I’ve never had real quality guards so I can’t really compare it, but it seems sturdy.. I guess time will tell. I do wish the guard was a different color (it’s clear) because I just don’t want to misplace it..Now, the biggest concern for me is the comfort and they got that right. 5 stars!

  • Erin Chapman

    Great for teeth grinders! I needed a mouth guard for sleeping that wouldn’t be too big and uncomfortable that I take it out during the night. Wanted one just for the top teeth and less bulky than the one I got from my dentist. Tried the OTC ones and I just remove them during the night, or they cause my teeth and jaw to hurt by morning due to the imperfect alignment. THIS ONE IS PERFECT. I read some reviews that said it was difficult to take the impression, but I watched the YouTube video and got it perfect the first try. Follow the instructions, use a mirror to place it and you won’t have a problem. It is not necessary to bite down hard into the plastic when taking the impression. Really just stay focused on getting a good, even impression. Seems like a lot for a little piece of plastic, but my dentist wanted to make me one for $800, so this was a much better deal. And best part, woke up without a headache for the first time in years. Cheers!

  • Marcelly A.

    A++++ Superb customer service. Superb product. I wear my Sentinel guard nightly and won’t go anywhere else! Thank you!

  • Jaycin Diaz

    MIX FAST! I mixed my putty too slow and the putty hardened before I was ready. I contacted the sentinel team and they sent me new putty. 2nd time around went much better but mix quickly because the putty will harden and you will not be able to get your teeth into it! End product fit great. I’ve been wearing it nightly and have seen a significant reduction in my jaw pain and morning headaches.

  • Brenda Mcgillis

    I love my new guard! Thank you!

  • Craig H.

    I have an unusual dental anatomy and feared the dental guard would not fit correctly. These guys are true professionals. They somehow managed to make a great fitting guard for me and I couldn’t be more satisfied. I have had dental guards made by other online companies and none of them fit.

    I did have to take my dental impression twice. The first time, it was rejected. They said they needed a better impression and gave me a redo kit for free.
    I spoke with a lady on the phone who was very helpful in giving me some tips for a better impression.

    The guard came within a week 1/2 of sending off the impression. It does take a little bit of time to get used to but stick with it. It will become comfortable after a few days or so.

  • Charles C.

    I have a horrible case of bruxism (night teeth grinding) and bought this to help me because most products store bought ones are so thick they trigger my gag reflex. Because of the slim size and unique material of this night guard, it has been helping me finally get a good nights’ sleep.This is different than most other ones I’ve tried. Thanks!

  • Brian W.

    When something is good, you stick with it. This is my 3rd order from you guys. I’ve been grinding my teeth since I was little and this holds up better than any of the ones my dentist made. Thank you for an outstanding product.

Free Shipping

We ship your kit with everything you need from the molding trays and putty to the prepaid return packaging.

90 day guarantee

Try it out! If you’re not satisfied, you can always return the Mouthguard within 90 days for a full refund.

Save 20%

By entering coupon code "big spender", you save 20% on orders over $200.